Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Changes in Benefit Obligation and Plan Assets
The following table summarizes changes in the benefit obligation and plan assets for (i) SERP and (ii) the other postretirement benefit plan as of December 31, 2014 and 2013:
 
SERP
 
Other Postretirement
Benefits
  
2014
 
2013
 
2014
 
2013
Benefit obligations:
  

 
  

 
  

 
 
Beginning of year
$
9,927

 
$
10,346

 
$
3,094

 
$
3,536

Service cost
270

 
326

 
45

 
42

Interest cost
456

 
377

 
132

 
173

Actuarial (gain) loss
777

 
(579
)
 
(134
)
 
(538
)
Benefits paid
(596
)
 
(543
)
 
(140
)
 
(119
)
End of year
10,834

 
9,927

 
2,997

 
3,094

Fair value of plan assets:
 
 
 
 
 
 
 
Beginning of year
—

 
—

 
—

 
—

Employer contributions
596

 
543

 
140

 
119

Benefits paid
(596
)
 
(543
)
 
(140
)
 
(119
)
End of year
—

 
—

 
—

 
—

Funded status at end of year, included in other liabilities
$
10,834

 
$
9,927

 
$
2,997

 
$
3,094

Amounts recognized in AOCI, net of tax:
 
 
 
 
 
 
 
Net actuarial loss
$
1,953

 
$
1,539

 
$
378

 
$
458

Prior service cost (credit)
17

 
29

 
(185
)
 
(185
)
Total
$
1,970

 
$
1,568

 
$
193

 
$
273
Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income
The components of net period benefit cost and other amounts recognized in OCI, before taxes, were as follows:
 
SERP
 
Other Postretirement
Benefits
  
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Net period benefit cost:
  

 
  

 
  

 
  

 
  

 
  

Service cost
$
270

 
$
326

 
$
269

 
$
45

 
$
42

 
$
70

Interest cost
456

 
377

 
408

 
132

 
173

 
148

Recognized net actuarial loss
140

 
224

 
114

 
10

 
48

 
31

Amortization of prior service cost (credit)
19

 
19

 
19

 
(22
)
 
(23
)
 
—

Net period benefit cost
885

 
946

 
810

 
165

 
240

 
249

Changes in funded status recognized in OCI, before taxes:
  

 
  

 
  

 
 
 
 
 
  

Net actuarial (gain) loss
777

 
(579
)
 
1,334

 
(134
)
 
(538
)
 
275

Reclassifications to net period benefit cost:
 
 
 
 
  

 
 
 
 
 
  

Amortization of net unrecognized actuarial loss
(140
)
 
(224
)
 
(114
)
 
(10
)
 
(48
)
 
(31
)
Amortization of prior service (cost) credit
(19
)
 
(19
)
 
(19
)
 
22

 
23

 
—

Total recognized in OCI, before taxes
618

 
(822
)
 
1,201

 
(122
)
 
(563
)
 
244

Total recognized in net period benefit cost and OCI, before taxes
$
1,503

 
$
124

 
$
2,011

 
$
43

 
$
(323
)
 
$
493
Schedule of Assumptions Used in Determining Benefit Obligations and Net Period Benefit Costs
The following assumptions were used in determining benefit obligations and net period benefit costs:
 
SERP
 
Other Postretirement
Benefits
  
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Weighted-average assumptions as of end of year:
  

 
  

 
  

 
  

 
  

 
  

Discount rate for benefit obligation
4.00
%
 
4.75
%
 
3.75
%
 
4.00
%
 
5.02
%
 
4.05
%
Discount rate for net period benefit cost
4.75
%
 
3.75
%
 
4.75
%
 
5.02
%
 
4.05
%
 
4.75
%
Rate of compensation increase for benefit obligation
4.00
%
 
4.50
%
 
4.50
%
 
—

 
—

 
—

Rate of compensation increase for net periodic benefit cost
4.50
%
 
4.50
%
 
4.50
%
 
—

 
—

 
—

Health care cost trend rate assumed for future years
—

 
—

 
—

 
7.00
%
 
7.00
%
 
7.00
%
Schedule of Estimated Future Benefit Payments
The expected benefit payments for the next ten years are presented in the following table:
 
SERP
 
Other Postretirement Benefits
2015
$
421

 
$
138

2016
489

 
135

2017
473

 
133

2018
473

 
128

2019
477

 
131

2020-2024
3,408

 
750